What is a 9 Lead motor?
This type of motor is probably the most commonly used in factories, lumber-mills, and other commercial plants. They are dual-voltage and can be wired for either 240VAC or 480VAC. Each motor will have 9 numbered leads coming out of the motor. The leads are numbered to aid the electrician when connecting the motor.
How can you tell if a motor is 3 phase?
First, you can check the motor nameplate data which is usually located on a paper or metal label attached to the side of the motor. Second you can simply look at the number of electrical leads coming out of the motor. If your motor has three black leads and a green lead then it is likely three phase.
What 3 things are needed for an induction motor to work?
A 3-phase induction motor includes two essential components namely the stator & the rotor. In this motor, the stationary part is the stator whereas the rotating part is the rotor. In this motor, the load is connected to the shaft. Three-phase armature winding can be wound over the stator.
What is the difference between induction motor and normal motor?
Difference between Three Phase Induction Motor and Synchronous Motor. The stator winding of Induction Motor is energized from an AC source. Synchronous Motor always runs at synchronous speed, and the speed of the motor is independent of load, but an induction motor always runs less than the synchronous speed.
How do you tell if a motor is thermally protected?
Thermal protectors generally reset themselves once the motor cools down to a safe operating temperature. There is usually a visible red button located on the wiring side of the motor—usually, though not always, located opposite of the motor shaft.
What causes a pump motor to overload?
Overloading of pumps Pump overloading occurs in centrifugal pumps when the driving motor draws excess current resulting in excess then normal power consumption. Thus, when the system resistance to the pump drops, more and more liquid is pumped resulting in increased power consumption.
How do you protect a motor thermally?
Thermal protection is a method of fan motor protection that is activated when a motor operating at the rated voltage locks up for some reason with the power still being supplied. It uses a thermal relay inside the motor to break the circuit to the winding coil at a temperature below the level that would cause burning.
How do you protect an overloaded motor?
Motor overload protection is necessary to protect the motor and to help ensure the motor performs as expected. Continuous duty motors are protected against overload by a separate overload device sized between 115% and 125% of the motor nameplate full-load current, FLA.
How can I protect my motor?
Circuit breakers and fuses are use as protection units for the different motors. Overcurrent protection can protect personnel from electric shock, the control equipment of the motor, the conductors of the motor branch circuits and the motor itself from high currents.
What should motor overloads be set at?
125%
What protects a motor during starting?
Short circuit protection is provided by fuses or circuit breakers in a Combination Motor Controller. Overload Protection: When a motor draws more current than it is designed to, an overload condition is caused. The main objective of an overload relay is to detect the excess currents.